erii-20260713 0001421517 False July 13, 2026 0001421517 2026-07-09 2026-07-09 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 9, 2026 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 1717 Doolittle Drive , San Leandro , California 94577 (Address of Principal Executive Offices)                  (Zip Code) ( 510 ) 483-7370 (Registrant’s telephone number, including area code) Not applicable (Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, $0.001 par value ERII The Nasdaq Stock Market LLC Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934. Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 5.02    Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On July 9, 2026, the Board of Directors (the “Board”) of Energy Recovery, Inc (the “Registrant”) appointed Mr. John Mitchell to its Board. With the appointment of Mr. Mitchell, the Registrant’s Board consists of six (6) directors. There are no arrangements or understandings between Mr. Mitchell and any other persons pursuant to which they were selected as a director. Mr. Mitchell will receive the same compensation (pro-rated for his actual service) and indemnification as the Registrant’s other non-employee directors. There are no family relationships between Mr. Mitchel and any of the officers or directors of the Registrant. There are no transactions between Mr. Mitchell and the Registrant that would be reportable under Item 404(a) of Regulation S-K. A copy of the press release announcing the appointment of Mr. Mitchell is furnished as Exhibit 99.1 hereto. Item 9.01    Financial Statements and Exhibits. (d)    Exhibits Exhibit Number Description 99.1 Press Release, issued by Energy Recovery on July 13, 2026 104 Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document. Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Energy Recovery, Inc. Date: July 13, 2026 By: /s/ William Yeung William Yeung Chief Legal Officer

Energy Recovery, Inc. appointed John Mitchell to its Board of Directors on July 9, 2026, expanding the board from five to six members. This governance change signals the company's intent to strengthen board oversight and capabilities.

On July 9, 2026, Energy Recovery, Inc. appointed Mr. John Mitchell to its Board of Directors, increasing the Board's size to six members. Mr. Mitchell will receive pro-rated compensation and indemnification similar to that of other non-employee directors. The filing includes confirmation that there are no arrangements dictating his selection, no family relationships affecting his role, and no transactions requiring disclosure under Item 404(a) of Regulation S-K. This change in governance may signal a strategic intent to enhance the Board's capabilities and oversight.

ENERGY RECOVERY, INC.

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